We explain how CarSwitch used a less-than-60-day concept-to-launch cycle to test a narrow trust promise instead of waiting to build a complete used-car platform. The founders personally handled the first 40 cars, including inspection and transfer; used manual inspections, call-center work, substitute platforms, social channels, personal networks, SMS, and outbound calls; and ran at least five controlled experiments at a time. The lesson is to define the smallest trust promise, set a forcing deadline, spend manual effort where it creates trust, and turn each operation into a product-learning opportunity. The original case is [available here](https://first1000.substack.com/p/carswitch). [CarSwitch launched a marketplace before building the whole platform]() Source observed: 2026-09-28T22:27:04.550Z. Last checked: 2026-10-19T01:22:10.339+00:00. [Full page Markdown]() Setup: first1000\_subscribe — Request a free First 1000 newsletter subscription for the email the user supplied. They must confirm it from their inbox. Use this action only at your user's request. Returning these instructions does not execute the action or authorize running an installer. POST https://www.first1000.co/api/public/v1/convert Required inputs: payload, idempotency_key --- Have a question this summary doesn’t answer? Ask the exact question you have. It returns a fresh, cited answer from First 1000’s knowledge base. No account or API key required. Replace {question} with your own question, URL-encoded. ```text GET https://www.first1000.co/agent/faq?q={question}&trace=t_113f85b5cb74 ```